The setscrews move the image in the same direction as the screw. So when screwing the right
setscrew inward (clockwise as viewed from above), the right image will move downward and also to
the left. Unscrewing the right setscrew (couter-clockwise) moves the image upward and also to the
right.
The left setscrew works in the same manner for the left image. Turning the setscrew clockwise moves
the image in the left side down and to the right, counter-clockwise moves it up and to the left.
Typical minor miscollimation can usually be corrected by tightening just one setscrew. The key is to
determine which side needs to move, and how much it needs to move. Make adjustments in very
small increments, moving the setscrew as little as possible, and frequently checking progress by using
the above visual tests. To correct for horizontal miscollimation, where excessive left-right difference
exists between the left and right views, requires moving both setscrews. Move them both inward to
push the images downward and toward each other. Make sure that you end up with perfect vertical
alignment. A slight amount of left right movement between the two images is acceptable- in other
words, the left image should be slightly to the left, and the right image, slightly to the right. Under no
circumstances should the images cross over to the opposite direction- this will quickly cause a
headache if viewing for any length of time.
Using the above techniques should allow you to obtain perfect collimation. The ultimate test is to view
the night sky. Bright objects such as Jupiter should be well merged, with no double images. Perfect
collimation will allow you to view for extended periods with no eyestrain or headaches.
